1) Periscope is used in submarines to see the happenings of events a. above sea level b. on sea level c. in algae abundant ares d. behind a wall or a barrier
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2) When red and blue are combined together, they form a. yellow b. magenta c. orange d. purple
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3) A magenta filter absorbs a. all colors except red b. all colors except magenta c. magenta only d. magenta and its components
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4) Most of the objects we see a. produce colors b. produce lights c. do not produce lights d. do not produce colors
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5) A colored film that fits over a lamp or camera to change the color of the light passing through it, is known as a. effecter b. film c. filter d. effect
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6) Light travels a. faster than sound b. slower than sound c. faster than gamma rays d. faster than x-rays
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7) When light enters a less dense medium, it bends a. away from the normal path b. towards the normal path c. away from the plane d. towards the plane
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8) The rods are mostly found a. in the center of retina b. at the blind spot c. at the edges of retina d. above and below retina
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9) The color blindness occurs due to a. lack of rods b. problem in rods c. problem in cones d. variation in cones
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10) Things that give off light are known as a. non luminous objects b. luminous objects c. transparent objects d. opaque objects
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11) The convex lens is also known as a. converging lens b. diverging lens c. dispersing lens d. conducting lens
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12) Light is refracted in air. It enters our eyes through different angle this is why a. dizziness occurs b. mirages appear c. close objects move far d. far objects seem closer
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13) The light which is refracted the least, is a. violet light b. red light c. blue light d. orange light
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14) Some objects look white in color like snow because they a. reflect all colors b. absorb all colors c. refract all colors d. absorb white color
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15) The change in speed of light when entering water is a. 5,000 km/s b. 50,000 km/s c. 100,000 km/s d. 200,000 km/s
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16) White light is a mixture of a. seven colors b. nine colors c. fourteen colors d. fifteen colors
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17) The refractive index assumes the entrance of light from a. glass b. water c. vacuum d. gas
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18) Inside rain droplet, light a. is refracted twice b. is refracted thrice c. is reflected once d. is reflected twice
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19) The lens in a human eye is a. convex b. concave c. biconcave d. biconvex
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20) If the angle of incidence of light while leaving the denser object is zero, the light would a. be reflected back b. go straight without any refraction c. be refracted d. end up at the boundary of the object
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